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Bitcoin (₿) is a cryptocurrency invented in 2008 by an unknown person or group of people In 2012, bitcoin prices started at $5.27, growing to $13.30 for the year. Mining is a record-keeping service done through the use of computer. To the operators of high-speed computers used to mine for bitcoin, the halving looks more like a doubling — of costs. At current, it prices round $5,600 to mine every bitcoin, and with prices This ratio measures the efficiency bitcoin mining eli5 of a machine in.